Concrete Calculator
Estimate concrete volume for slabs, footings, and columns in cubic yards and bags needed.
Typical 60 lb bag yields ~0.45 cu ft — check your bag label
Result
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Enter dimensions and click Calculate.
Compute volume from shape dimensions, convert to cubic yards, then estimate bags from bag yield (cu ft per bag).
Slab, footing, or column.
Include depth/thickness carefully in consistent units.
Optional — use the label value for bagged mix.
Patio slab.
About 1.23 cubic yards (order extra for waste).
Leaving depth in inches
Fix: Convert thickness to feet (divide by 12).
Ordering exact volume with no waste
Fix: Add a contingency percentage.
Confusing area with volume
Fix: Volume needs depth — use square footage for area only.
Estimate concrete volume for slabs, footings, and columns in cubic yards and bags needed.
Typical 60 lb bag yields ~0.45 cu ft — check your bag label
Result
—
Enter dimensions and click Calculate.